This document summarizes the key updates and features in Android M (Marshmallow), Google Play Services 7.8, and Android tools and libraries. Some highlights include runtime permissions in Android M, auto app backup, power saving optimizations, new APIs in Google Play Services like Nearby Messages and Face API, and support libraries for navigation, snackbars, tabs and more. The document provides code samples and best practices for using the new features.

1. What’s New in Android
+Adam Koch
+Ankur Kotwal

2. Agenda
Android M Release
Google Play Services v7.8
Android Tools & Libraries

3. Android M

4. Android M…?

6. Android
Marshmallow

7. Available now for Nexus 5/6/9, Player & emulator
developer.android.com/preview
Get your apps ready!
Provide feedback and report bugs
Issue tracker: goo.gl/zcjEj7
Google+ community: goo.gl/BIq1eJ
Android M Developer Preview

8. On August 17 we released:
- Developer Preview 3 ROMs
- Final Android 6.0 (Marshmallow) SDK
Start publishing to Play today!
M Preview Timeline You are here

9. Getting Started with Marshmallow
android {
compileSdkVersion 23
buildToolsVersion '23.0.0'
defaultConfig {
applicationId 'com.google.samples.apps.mpreviewtest'
minSdkVersion 23
targetSdkVersion 23
versionCode 1
versionName '1.0'
}
}

10. Runtime permissions!
Auto Backup
Power-Saving Optimizations
Other behavior changes:
- Adoptable Storage Devices
- AndroidHttpClient -> HttpUrlConnection
- OpenSSL -> BoringSSL
- And more: goo.gl/cf4lwy
Android M Behavior Changes

11. Why should you care?
- Significantly different behavior (after targeting M)
- No permission dialog on install --> less friction
- App updates --> automatic
- Fine grained, revocable permissions --> user feels in
control, improved user experience
Runtime Permissions

12. targetSdkVersion < M targetSdkVersion = M+
Pre-M device
Install time permission dialog
All permissions granted
M device
Install time permission dialog
All permissions granted
User can revoke permissions
No dialog during install
No permissions granted initially
App can request permissions
User can revoke permissions
Runtime Permissions

13. Runtime Permissions
Location
Camera
Microphone
Phone
All location permissions
Photo and video permissions
Audio recording
Phone state, dialing, etc.
SMS
Contacts
Calendar
Sensors
Storage
Controlling or reading SMS/MMS/etc.
Managing contacts
Managing calendars
Body sensors
Read, write external storage

14. Best Practices
Only ask for what you need, when you need it
Don’t overwhelm the user
Consider using system Intents if possible
Explain why you need permissions
Runtime Permissions

17. Context.checkSelfPermission(String permission)
Activity.requestPermissions(
String[] permissions, int requestCode)
Activity.onRequestPermissionsResult(
int requestCode, String[] permissions,
int[] grantResults)
New permissions methods
ContextCompat.checkSelfPermission(String permission)
ActivityCompat.requestPermissions(
String[] permissions, int requestCode)
ActivityCompat.onRequestPermissionsResult(
int requestCode, String[] permissions,
int[] grantResults)
*Also in Support Library (v23)

18. static final int LOCATION_PERMISSION_REQUEST_RESULT = 2;
...
if (checkSelfPermission(Manifest.permission.ACCESS_FINE_LOCATION)
!= PackageManager.PERMISSION_GRANTED) {
requestPermissions(
new String[]{Manifest.permission.ACCESS_FINE_LOCATION},
LOCATION_PERMISSION_REQUEST_RESULT);
}
Requesting a permission

19. @Override
public void onRequestPermissionsResult(
int requestCode, String[] permissions, int[] grantResults) {
switch (requestCode) {
case LOCATION_PERMISSION_REQUEST_RESULT: {
if (grantResults[0] == PackageManager.PERMISSION_GRANTED) {
// Granted!
} else {
// Denied!
}
}
}
}
Checking if permission was granted

20. If shouldShowRequestPermissionRationale()
returns true then show your own in-app UI
explaining why you need the permission.
When does it return true? If the user has denied the
permission in the past (but NOT checked “Don’t ask
again”).
Showing your own explaination

21. Free and automatic app data backup (and restore)
Up to 25MB per user per app
Occurs every 24 hours
Enabled for *all* apps running on M Preview (but for
M final only targetSdkVersion=M)
Auto Backup for Apps

22. Use platform APIs correctly, don’t hardcode paths:
getFilesDir(), getExternalFilesDir(), etc. will be backed up
getCacheDir(), getExternalCacheDir(), etc. will not be backed up
Exclude device-specific identifiers from backup
(eg. GCM registration ID, etc.)
Auto Backup for Apps

23. Configuring Auto Backup
AndroidManifest.xml
<application ...
android:fullBackupContent="@xml/mybackupscheme" />
xml/mybackupscheme.xml
<full-backup-content>
<include domain=["file"|"database"|"sharedpref"|"external"|"root"] path="string" />
<exclude domain=["file"|"database"|"sharedpref"|"external"|"root"] path="string" />
</full-backup-content>

24. # enable logging
$ adb shell setprop log.tag.BackupXmlParserLogging VERBOSE
# initialize Backup Manager
$ adb shell bmgr run
# trigger backup or restore
$ adb shell bmgr fullbackup <PACKAGE>
$ adb shell bmgr restore <PACKAGE>
Testing Auto Backup

25. Doze
increase standby time of devices
that aren’t being used
App Standby
reduce overhead of apps that are
installed but not used recently
Power-Saving Optimizations
flickr/trophygeek

26. Network access disabled (except high priority GCM)
Wake locks are ignored except for alarms set with setAlarmClock()
and setAndAllowWhileIdle()
Syncs and JobScheduler tasks are not allowed to run
Test with:
Doze
$ adb shell dumpsys battery unplug
$ adb shell dumpsys deviceidle step
$ adb shell dumpsys deviceidle -h

27. Apps considered idle unless:
- explicitly launched by user
- has a foreground process
- visible notification
- user asks for the app to be exempt
Idle apps are restricted:
- network access disabled
- syncs and background jobs suspended
App Standby

28. Android M New Platform Features
Direct Share
Fingerprint API & Confirm Credentials
Voice Interactions & Assist API
App Linking
Text Selection
And much more:
- Bluetooth Stylus, 4K Display, MIDI, Camera,
Android for Work...

29. Other Smaller Additions

30. Other Small Additions
After:
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:foreground="@drawable/selector">
...
</LinearLayout>
Before:
<FrameLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:foreground="@drawable/selector">
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content">
...
</LinearLayout>
</FrameLayout>

31. Other Small Additions
Notifications
New android.graphics.drawable.Icon,
- Icon.createWithBitmap(Bitmap) for dynamic icons
Notification.Builder.setSmall/LargeIcon(Icon)
getActiveNotifications()

32. And lots more...
Fingerprint API & Confirm Credentials
Voice Interactions & Assist API
App Linking
Text Selection
Bluetooth Stylus
4K Display
MIDI
Camera
Android for Work…

33. Google Play
Services v7.8

34. Nearby Messages
Find nearby devices or beacons and
share messages
Cross platform support
Android & iOS
Unauthenticated
(Does not require a Google account)
Uses a variety of tech under the hood
Bluetooth, Bluetooth Low Energy, Wi-Fi and an
ultrasonic modem

35. Face API & Barcode API
Mobile Vision API

36. Smart Lock for Passwords
Credentials API
● auth.credentials.save
● auth.credentials.request
com.google.android.gms.auth.api.c
redentials.CredentialsApi

37. Creates a unique ID per app per install
Generate security tokens for services (suited for user by GCM)
Verify app authenticity & check if app install is active via web API
InstanceID
// Get InstanceID
String iid = InstanceID.getInstance().getID();

38. Topic based subscriptions
New base classes for receiving GCM messages
GCM Network Manager
Google Cloud Messaging

39. GCM Network Manager
GcmNetworkManager JobScheduler
Run during specific
time window
Supported
(one off, periodic)
Supported
(one off, periodic)
Require device charging Supported Supported
Specify network type Supported Supported
Require device idle Not Supported Supported
Execute by deadline Not Supported Supported

40. Android Tools
& Libraries

41. C/C++ support (coming soon)
- integrated debugging,
code completion, refactoring
Debugger improvements
Separate unit testing module
Speed improvements
Visual theme editor, layout editor improvements
Android Studio

42. Android Studio

43. Drawable Resources
Bitmap Vector

44. compile 'com.android.support:design:23.0.0'
Android Design Support Library

45. Floating labels for hint and error text
Built-in animations
Wrap EditText in a TextInputLayout
TextInputLayout

46. Providing lightweight quick feedback to your users
Snackbar
.make(parentLayout, “My Text”, Snackbar.LENGTH_LONG)
.setAction(“My Action”, myOnClickListener)
.show(); //Don’t forget to show!
Snackbar

47. Top level navigation or grouping content
tabGravity = center, fill
tabMode = scrollable, fixed
TabLayout

48. ● Component to create view inside
Navigation Drawer
● Used with DrawerLayout
● Load items from menu resources
NavigationView

49. Built-in component for FAB, follows
design spec
Default color = ?attr/colorAccent
fabSize = full, mini
Floating Action Button (FAB)

50. Provide additional level of control between child
views
Coordinate different Views
- FloatingActionButton
- Snackbar
- Toolbar, Tabs
Each View sets own behavior
- CoordinatorLayout.Behavior
CoordinatorLayout

51. compile 'com.android.support:percent:23.0.0'
Managing percent based dimensions
<android.support.percent.PercentFrameLayout ...>
<ImageView app:layout_widthPercent="50%"
app:layout_heightPercent="50%"
app:layout_marginTopPercent="25%"
app:layout_marginLeftPercent="25%"/>
</android.support.percent.PercentFrameLayout>
Percent Support Library

52. Placing a FAB - Before
private void addFloatingActionButton() {
final int fabSize =
getResources().getDimensionPixelSize(R.dimen.fab_size);
int bottomOfQuestionView =
findViewById(R.id.question_view).getBottom();
final LayoutParams fabLayoutParams =
new LayoutParams(fabSize, fabSize, Gravity.END | Gravity.TOP);
final int fabPadding =
getResources().getDimensionPixelSize(R.dimen.padding_fab);
final int halfAFab = fabSize / 2;
fabLayoutParams.setMargins(0, // left
bottomOfQuestionView - halfAFab, //top
0, // right
fabPadding); // bottom
addView(mSubmitAnswer, fabLayoutParams);
}

53. <android.support.design.widget.CoordinatorLayout ...>
<TextView android:id="@+id/textLayout" />
<android.support.design.widget.FloatingActionButton ...
android:src="@drawable/ic_action_map"
app:layout_anchor="@id/textLayout"
app:layout_anchorGravity="bottom|start" />
</android.support.design.widget.CoordinatorLayout>
Placing a FAB - After

54. Android Developer Blog Post
goo.gl/THH9OA
DevByte Video
goo.gl/0jhXFb
Cheesesquare Sample
github.com/chrisbanes/cheesesquare
Resources

55. Thank You!
Questions?
+Adam Koch +Ankur Kotwal